Relations between Crystal Car Wash owner Anthony Sahade and his neighbours on Australia's wealthiest street have hit a new low after he and his family were ordered to stop playing loud music, shining a spotlight into their homes and driving dangerously on their shared waterfront property.

Mr Sahade, his son Victor and wife Rita have been embroiled in a dispute with Eckhart Bischoff and his wife Celia for years over the battleaxe block they share on Wolseley Road, Point Piper.

The Bischoffs and Carina Gilster, who owns the third lot of the three-lot strata scheme, took the Sahades to the NSW Civil and Administrative Tribunal, claiming that they and their visitors used threatening behaviour and language.

Senior member Richard Buckley said that, over the past four years, the relationship between the neighbours "has become toxic to the extent that the degree of disharmony has prevented any level of co-operation or reason to apply".

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He said that, since May 2005, Mr Sahade's conduct had been "characterised by a lack of civility, arrogance, threatening behaviour, a disdain for the rights of other lot owners and a disregard for the obligations imposed" by strata laws.

In April 2013, a Local Court magistrate threw out two assault charges against Mr Sahade, who was accused of punching Mr Bischoff in the face and ribs when tensions over the demolition of a timber staircase boiled over.

On Wednesday, Mr Buckley found the Bischoffs and Ms Gilster had a "compelling" case.

He ordered the Sahades not to "unreasonably use spotlights" erected by them on the northern boundary fence of their lot "so as to unreasonably illuminate or shine into the interior" of lots 1 and 2.

Anthony and Victor were ordered not to "threaten or act in an aggressive manner" towards their neighbours.

They were also told not to park on common property, nor allow their guests to do so, and Victor was ordered not to drive on common property in a "dangerous and noisy manner".

Further, the Sahades must not play music "of unreasonable loudness" or at times that would be "disruptive" to their neighbours.

He also found the Sahades had made a number of alterations and additions to common property without consent of the Owners Corporation.

These included the installation of skylights, placing a glazed skillion roof on the southern courtyard and a deck.

He ordered the family to prepare "exclusive use bylaws" and submit them to the Owners Corporation.

The Bischoffs and Ms Gilster asked that, if they failed to do so, the Sahades should be ordered to remove the unauthorised works.

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